期刊论文

中文

灌溉排水学报

1672-3317

2018

S1

87-90

10.13522/j.cnki.ggps.2017.0718

国家自然科学基金项目（51608545,31270671）；

本校为第一机构

【目的】对比分析带根原状土和无根素土的强度机理,探明根系对根-土复合体强度的影响规律。【方法】选取模型箱中不同深度的带根原状土和无根素土分别进行了室内直剪试验。【结果】草本植物根系对土体具有明显的加筋作用,在相同条件下,带根原状土黏聚力明显高于同一深度的无根素土。与无根素土相比,带根原状土抗剪强度的增加主要体现为黏聚力的增加。随着土层深度的增加,根系密度逐渐下降,在此基础上,分别提出了根-土复合体的黏聚力与土层深度和根系分布密度的关系式。其中根-土复合体的黏聚力呈二次抛物线递减,根土复合体的黏聚力随土体中的根系分布密度的增大而呈幂函数形式增大。【结论】在进...

【Objective】Analyse the strength of the undisturbed soil and rootless soil mechanism,and explore the composite displine of root and strength.【Method】The indoor direct shear tests were carried out on with different depths roots and rootless soil in the model box respectively.【Result】The strengths of soils were reinforced obviously,when the roots of herbaceous plants were existed in these soils.Under the same conditions,the cohesive force of the undisturbed soil with roots was obviously higher than that of the rootless soil at the same depth...